Fix prediction sample to comply with updated insert request and take data as command-line flag.
Reviewed in http://codereview.appspot.com/4535113/
Index: samples/prediction/README
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diff --git a/samples/prediction/README b/samples/prediction/README
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+Before you can run the prediction sample prediction.py, you must load some csv
+formatted data into Google Storage. You can do this by running setup.sh with a
+bucket/object name of your choice. You must first create the bucket you want to
+use. This can be done with the gsutil function or via the web UI (Storage
+Access) in the Google APIs Console.